PATA DMA is disabled

[Robin Laing]

R.M.Albrecht wrote:
> Hi,
> 
> 2.6.18 (2647) did not fix the pata dma-problem:
> 
> [root at helios ~]# hdparm -d /dev/hdc
> 
> /dev/hdc:
>  using_dma    =  0 (off)
> [root at helios ~]# hdparm -d 1 /dev/hdc
> 
> /dev/hdc:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
> [root at helios ~]#
> 
> Or do I have to do some configuration change ?
> 
> cu romal
> 
> 
> 
> On Fri, Aug 25, 2006 at 04:39:28PM +0200, R.M.Albrecht wrote:
> 
>>But the canoncial solution would be to enable DMA ? Has anyone an idea
>>where the problem lies ?
> 
> 
> You need a new enough kernel to handle the ICH6M SATA and PATA together
> nicely
> and the devices not to be in compatibility mode.
> 
> Alternatively build 2.6.18-rc4-mm2 and select the Intel PIIX/ICH driver from
> that without the "old IDE" PIIX driver and it should grab all the
> devices and
> put them under /dev/sda /dev/sr0 etc using libata.
> 
> Alan
> 

I found that I had to set a flag for my laptop to use dma.

Google for ICH6 flags to set in grub.

I can play DVD's and videos from my HD or DVD player under FC4. :)



-- 
Robin Laing
Instrumentation Technologist   Voice: 1.403.544.4762
Military Engineering Section   FAX:   1.403.544.4704
Defence R&D Canada - Suffield  Email: Robin.Laing at DRDC-RDDC.gc.ca
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